Samba and force user

Hi (openSUSE 13.1 kde 4.12)
sorry but there is someone who has managed to create a samba sharing, writable by the various client


[SharedOnNet]
    comment = %L/Shared_on_%I                             
    path = /home/Shared                                   
    case sensitive = No                              
    ;============== security ==============
    available = Yes                                       
    browseable = Yes                                      
    admin users =                                         
    valid users = @users pippo jhon                              
    ; invalid users = root
    public = Yes                                         
    read only = No
    write list = @users pippo jhon            
    read list =                                           
    follow symlinks = No
    ; prefix allow list =                                 
    ; prefix deny list =                                  
    hide dot files = yes
    hide special files = yes
    hide unreadable = no
    hide unwriteable files = no
    strict locking = No                                   
    ;========= samba permissions ==========
    inherit acls = Yes                                    
    ; inherit owner = Yes
    ;inherit permissions = Yes
    inherit permissions = No 
    vfs objects = acl_xattr                               
    acl group control = Yes
    acl map full control = Yes
    nt acl support = Yes
    profile acls = No
    map acl inherit = Yes
    map archive = no
    ; force unknown acl user = No
    force user = erika                            
    force group = users
    create mask = 2777                                
    directory mask = 2777
    force create mode = 2777
    force directory mode = 2777

Why, files created in the share “Public” are not owned by the user “guest” of the “users” group, since I’m going to force the name of the owner ?
regarding its permissions to access them, do not want it to become 777 ? bhooooo … I do not understand

    
[global]
    ....
    guest account = guest 
    ...

[Public]
    comment = %L/Public_on_%I                             
    path = /home/Public                                   
    case sensitive = No
    ;============== security ==============
    available = Yes                                       
    browseable = Yes                                      
    admin users =    
    valid users = @users guest nobody                       
    invalid users = root                                
    guest ok = Yes
    ; only guest = No
    read only = No
    write list = @users guest nobody                            
    read list =                                           
    follow symlinks = No
    ; prefix allow list =                                 
    ; prefix deny list =                                  
    hide dot files = yes
    hide special files = yes
    hide unreadable = no
    hide unwriteable files = no
    strict locking = No                                   
    ; null passwords = Yes      
    force user = guest                            
    force group = users
    create mask = 2777                                 
    directory mask = 2777
    force create mode = 2777    
    force directory mode = 2777